WIJESUNDARA, T., 2004. Low-cost defluoridation of water using broken bricks. IN: Godfrey, S. (ed). People-centred approaches to water and environmental sanitation: Proceedings of the 30th WEDC International Conference, Vientiane, Laos, 25-29 October 2004, pp. 521-525.
A low cost domestic defluoridator has been developed by the National Water Supply & Drainage Board of Sri Lanka to
remove excess fluoride in drinking water to avoid endemic Fluorosis. Broken pieces of freshly burnt bricks are used as
filter media in these units. A kinetic model for fluoride uptake in the filter with broken bricks as defluoridating agent is
considered and the model parameters are estimated using experimental data. Data concerning the uptake of fluoride on
broken brick pieces are obtained from water in batch in the defluoridator. The reaction rate parameter, k, and the capacity
parameter fm are estimated and the model fits the collected data satisfactorily. fm is estimated to 0.10 mg/g and k which
is a function of initial concentration varies between 0.001 and 0.0005 L/ (mg.ho.5) for low and high initial concentration.
Broken bricks could be used as filter media for concentration of fluoride in raw water around 2 mg/1.